Do not use this, as PDO has been moved into core (the php source) so this pecl extension is dead.

PDO provides a uniform data access interface, sporting advanced features such
as prepared statements and bound parameters. PDO drivers are dynamically
loadable and may be developed independently from the core, but still accessed
using the same API.

Release notes
Version 1.0.2
(stable)

&ast;&ast; NOTE WELL&excl; &ast;&ast;All the PDO&lowbar;XXX constants have been renamed to PDO&colon;&colon;XXX form for futurecompatibility with PHP namespaces&period; Sorry for the inconvenience&comma; especiallyafter Release Candidate 1&period;

You need to install a PDO database driver to make use of PDO&comma;check http&colon;&sol;&sol;pecl&period;php&period;net&sol;package-search&period;php&quest;pkg&lowbar;name&equals;PDOfor a list of available PDO drivers&period;

It is highly recommended that you update to PHP 5&period;1 before using PDO&period;

If you are running on Windows&comma; you can find a precompiled binary at&colon;http&colon;&sol;&sol;pecl4win&period;php&period;net&sol;ext&period;php&sol;php&lowbar;pdo&period;dll

You should uninstall and re-install your individual database drivers wheneveryou upgrade the base PDO package&comma; otherwise you will see an error about PDO APInumbers when you run your PHP scripts&period;